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Q0906+6930 is the most distant known blazar (redshift 5.47 / 12.2
billion light years), discovered in July, 2004. The engine of the
blazar is a supermassive black hole (SMBH) approximately 2 billion
times the mass of the Sun (the mass of the Milky Way Galaxy is
around 580 billion solar masses). The event horizon volume is on
the order of 1000 times that of the Solar System. It is one of the
most massive black holes on record. The "distance" of a
far away galaxy depends on what distance measurement you use. With
a redshift of 5.47, light from this active galaxy is estimated to
have taken around 12.3 billion light-years to reach us. But since
this galaxy is receding from Earth at an estimated rate of 285,803
km/s (the speed of light is 299,792 km/s), the present (co-moving)
distance to this galaxy is estimated to be around 26 billion
light-years (7961 Mpc).
